error codes -6129, 0

for your reference

https://quickbooks.intuit.com/learn-support/en-us/open-programs/resolve-error-6000-when-opening-a-co...

How can I resolve this error code?

Thanks for posting here, @JSB2400,

I want to make sure you're able to work within your company file without any issues. To help you with this, I need some more information about the error you're getting so I can check on this further.

Where does this error pop up in QuickBooks? Is there a specific task you're working on when you see the alert? Any information will help.

In the meantime, proceed to repairing software to fix program issues in QuickBooks. To do that, follow the steps below:

1. Create a back up your company file beforehand to avoid any accidental data loss.
2. Reboot the computer and tap the Windows Start menu.
3. Find Control Panel on the search field or select it from the list.
4. Press Programs and Features then Uninstall a Program.

   Note: If you don't see Programs and Features, select Programs instead. Then select Program and Features.

5. Pick QuickBooks from the list of Programs, then press Uninstall/Change.
6. Click on Continue, or Next. then Repair.
7. Press Next again then wait for the tool to start its diagnosis.
8. Hit Finish when done.

To learn more about repairing QuickBooks and its complete steps, go to this link: Repair your QuickBooks Desktop for Windows.

If all else fail, I'd recommend that you work with our Technical Support Team again. I know you already called them but only our representatives can run some tests on your company file to check  what's causing this odd behavior. 

To get our Support, follow the steps below:

1. Open QuickBooks and click the Help menu.
2. Select QuickBooks Desktop Help.
3. On the pop-up screen select Contact us.
   
4. Click the Search for Something else button then type your concern in the Ask us anything box.
5. Hit Search then scroll down to get your contact options.

Let me know how it goes. I'll be right here if you need anything else, as I want to make sure this is taken care of. Have a good one!